[Bug 67454] After suspend/resume, screen is black for all but the highest levels with i915 driver on MacBook Air 6,2

[bugzilla-daemon at freedesktop.org]

https://bugs.freedesktop.org/show_bug.cgi?id=67454

--- Comment #54 from Jani Nikula <jani.nikula at intel.com> ---
(In reply to comment #53)
> Jani,
> 
> Thanks so much for your quick reply!
> 
> (In reply to comment #50)
> > Please get current intel-gpu-tools, boot, get reg dump using
> > intel_reg_dumper, suspend, wait a minute, resume, get reg dump using
> > intel_reg_dumper, make sure the problem is present at this stage, attach
> > dumps clearly named.
> 
> Done. Running release kernel 3.12.
> 
> I don't know much about the GPU registers, but diff didn't appear to show
> anything interesting, so I'm guessing you'll still need more information.
> 
> Please advise on next troubleshooting steps and I'll be glad to oblige.

If you're *aching* for something, anything, to try, there's backlight-rework
branch at [1] that I'm working on. It's an *UNTESTED* work-in-progress series
towards fixing some issues we have, but no guarantees it will work al all.
You've been warned.

[1] git://gitorious.org/jani/drm.git

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